The file /var/lib/dpkg/info/ssmtp.config contains the following lines:
if [ -f /etc/ssmtp/ssmtp.conf ]
then
for v in `grep -E
"^(root|mailhub|rewriteDomain|hostname|FromLineOverride)="
/etc/ssmtp/ssmtp.conf`
do
export $v
done
So it was reading your /etc/ssmtp/ssmtp.conf and found something that
could not be exported.
** Package changed: ubuntu-release-upgrader (Ubuntu) => ssmtp (Ubuntu)
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https://bugs.launchpad.net/bugs/1897523
Title:
upgrade bug from 18.04 to 20.04; dpkg: error processing package ssmtp
(--configure): installed ssmtp package post-installation script
subprocess returned error exit status 2
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